Distributed Strain Sensing Based on Combination of Brillouin Gain and Loss Effects in Brillouin Optical Correlation Domain Analysis

Weiwen Zou, Chongjiu Jin and Jianping Chen

State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Key Laboratory of Navigation and Location Based Services, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China 

Applied Physics Express Volume 5 Number 8 2012 082503

doi:10.1143/APEX.5.082503

Abstract 

We propose a novel scheme to improve the Brillouin optical correlation domain analysis (BOCDA) system by combining Brillouin gain and loss effects. Periodical chopping of the dc bias of a dual-parallel Mach–Zehnder modulator is used to successively generate upshifted or downshifted single-sideband signal with suppressed carrier. The successively generated signal serves as a Brillouin pump (probe) to amplify (absorb) the carrier for lock-in detection of the net gain between Brillouin gain and loss effects. The signal-to-noise ratio of the novel scheme is twofold enhanced and the feasibility of distributed strain sensing with a nominal spatial resolution of 1.6 cm is experimentally demonstrated.

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